<SEC-DOCUMENT>0000040729-15-000045.txt : 20150121
<SEC-HEADER>0000040729-15-000045.hdr.sgml : 20150121
<ACCEPTANCE-DATETIME>20150121165019
ACCESSION NUMBER:		0000040729-15-000045
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20150102
FILED AS OF DATE:		20150121
DATE AS OF CHANGE:		20150121

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Ally Financial Inc.
		CENTRAL INDEX KEY:			0000040729
		STANDARD INDUSTRIAL CLASSIFICATION:	FINANCE LESSORS [6172]
		IRS NUMBER:				380572512
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		MAIL CODE: 482-B09-C24
		STREET 2:		200 RENAISSANCE CENTER
		CITY:			DETROIT
		STATE:			MI
		ZIP:			48265
		BUSINESS PHONE:		866-710-4623

	MAIL ADDRESS:	
		STREET 1:		MAIL CODE: 482-B09-C24
		STREET 2:		200 RENAISSANCE CENTER
		CITY:			DETROIT
		STATE:			MI
		ZIP:			48265

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GMAC INC.
		DATE OF NAME CHANGE:	20090701

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GMAC LLC
		DATE OF NAME CHANGE:	20060720

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GENERAL MOTORS ACCEPTANCE CORP
		DATE OF NAME CHANGE:	19920703

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Halmy Christopher A
		CENTRAL INDEX KEY:			0001603746

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-03754
		FILM NUMBER:		15539065

	MAIL ADDRESS:	
		STREET 1:		C/O ALLY FINANCIAL INC.
		STREET 2:		200 RENAISSANCE CENTER
		CITY:			DETROIT
		STATE:			MI
		ZIP:			48265
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>wf-form4a_142187700904424.xml
<DESCRIPTION>FORM 4/A
<TEXT>
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    <documentType>4/A</documentType>

    <periodOfReport>2015-01-02</periodOfReport>

    <dateOfOriginalSubmission>2015-01-06</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000040729</issuerCik>
        <issuerName>Ally Financial Inc.</issuerName>
        <issuerTradingSymbol>ALLY</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001603746</rptOwnerCik>
            <rptOwnerName>Halmy Christopher A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 RENAISSANCE CENTER</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DETROIT</rptOwnerCity>
            <rptOwnerState>MI</rptOwnerState>
            <rptOwnerZipCode>48265</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Financial Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

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            <transactionCoding>
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                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>25770</value>
                </transactionShares>
                <transactionPricePerShare>
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                <transactionCode>M</transactionCode>
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        </nonDerivativeTransaction>
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    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Deferred Stock Units (DSU)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F4"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2015-01-02</value>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
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                    <value>2981</value>
                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2981.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>88939</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
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                </directOrIndirectOwnership>
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            <transactionDate>
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            </transactionDate>
            <transactionCoding>
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                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>25770</value>
                    <footnoteId id="F5"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
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            <exerciseDate>
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            </exerciseDate>
            <expirationDate>
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            </expirationDate>
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                </underlyingSecurityTitle>
                <underlyingSecurityShares>
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                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
                    <value>63169</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Incentive Restricted Stock Units (IRSU)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F6"/>
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            <transactionDate>
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            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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                </transactionShares>
                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
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                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The common stock reported includes (i) shares issued upon the settlement of a portion of DSUs awarded in prior periods, plus (ii) shares issued as a result of the immediate settlement of the portion of DSUs granted, to pay applicable taxes.</footnote>
        <footnote id="F2">Represents the per share fair market value of the Company's common stock as of December 24, 2014.</footnote>
        <footnote id="F3">The common stock reported includes shares issued upon the settlement of a portion of IRSUs awarded in prior periods.</footnote>
        <footnote id="F4">Each Deferred Stock Unit (DSU) represents a vested right to receive the value of one share of the Company's common stock in cash equal to the fair market value of a share of the Company's common stock.  A portion of all DSUs granted are immediately settled to pay applicable taxes. DSUs do not have an expiration or exercise date or carry a conversion price. May reflect rounding of fractional shares.</footnote>
        <footnote id="F5">Amount includes 24,026 DSUs that were inadvertently omitted from the original Form 4 filing.</footnote>
        <footnote id="F6">Each Incentive Restricted Stock Unit (IRSU) represents a contingent right to receive the value of one share of the Company's common stock in cash on the applicable settlement dates.  IRSUs do not have an expiration or exercise date or carry a conversion price.  Reflects a fractional share rounded up to the nearest full share.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Cathy L. Quenneville, attorney-in-fact for Mr. Halmy</signatureName>
        <signatureDate>2015-01-21</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
